US1876124A - Wireless telegraphy and telephony - Google Patents

Wireless telegraphy and telephony Download PDF

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Publication number
US1876124A
US1876124A US247350A US24735028A US1876124A US 1876124 A US1876124 A US 1876124A US 247350 A US247350 A US 247350A US 24735028 A US24735028 A US 24735028A US 1876124 A US1876124 A US 1876124A
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US
United States
Prior art keywords
telephony
frequency
aerials
valves
oscillator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US247350A
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English (en)
Inventor
Wright George Maurice
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US1876124A publication Critical patent/US1876124A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0817—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection

Definitions

  • the resultant would tend According to this invention in multiple receiving aerial sum total of signalstrength obtained from a plurality of aerials should not be liable to approximate to zero as a result of fading.
  • receivingtsystems means are provided for comb ning the signals from the aerials na common ciroult, n, such manneras to be a effectively additive irrespective of phase re- .lationship; it i 3 the, oscillators,
  • Fig re lr shows n conventlonal diagrammatic form a receivmanner that only nADfo oonroiin Application filed zranuar v, 1928, Serial No. 24,7;350, and in Great Britain January 1'7, 1927 6- mg installation comprising two aerials,-and i Figure 2 a receiving installation comprising four, aerials. Itis, of course, tobe under stood that the inventionis applicable to re- .a ns C mpr s ng y d s
  • Figure 3 illustrates apparatus for carrying out the present invention with a rotating commutator and, R
  • the-oscillators may be supplied, ifrom-a-plural1tyof note generators fhaving definitephasefiisplacementone to, another, or, alternatively; there may beemployed arotating commutator orlikedevicearranged to rerfder eachrreceiver, operative in turn at an flgaudrblema-te.
  • valves 20' and 19 to become conductive alternately.
  • tery B and the resistance R are short circuited by the commutator. 7 Similarly, and alternately pvalve 20:becomes"condujctivezand am- Again, in a multiple aerial receiving systern; operating .on the heterodyne; pr nc ple,
  • a methodjof using a e-cenin-g system-"operating on the heterodyne prinj Figure 4 shows 5ciple,"the receiver oscillations-being controlled from the commonnote f'requenoy generator positive half wave from generator 2 8 While lJlIB other functions during the other 1 half -wavel That is, the two'high frequency'oscillators 4:5, 46" are made” to operate, by virtue of varying plate petentials, ;0n' alternate half I As the 'grid biasing V resistance R is high, valvejl9 becoines oonvductive only when the combination of the batcycles of the local oscillator '28.
  • Radio signalling apparatus comprising a j 2; Radio'fsignalling apparatus; comprising means for collecting electromagnetic energy of like frequency-at a plurality of'separated lected' near to'each point of collectionwith locally generated electricalenergy,andmeans for translating successively the resulting beatea'rotatlng-commutator, theflillustration being.
  • Radio signalling apparatus comprising means for collecting-relectromagnetic energy of like frequency at a plurality'o'f-separated dfrom each means for beating the ener-g'ies soeole points,means for locally generating electrical energy, means for beating the locally generated energy and the collected energies, and
  • i 4. In a radio signalling system, the combination of a plurality of collectors collecting energy of like frequency, a local oscillator, means for beating the output of the local oscillator and the energy collected at each one of said collectors, means for feeding the resulting beat frequency energy into a common circuit, electron discharge devices 5 associated with said common circuit, and
  • a plurality of separated antennae each collecting energy of like frequency, an electron discharge device coupled to each of said antennae, a pair of electron. discharge devices connected in push-pull fashion, a source of alternating current coupled to the control electrodes of the electron discharge devices connected in push-pull fashion whereby the electron stream in each 0 of said push-pull connected devices is alternately turned on and ofi, circuits for coupling the outputs of each electron discharge devices at each antenna to a pair of input electrodes of said push-pull connected electron discharge devices, and means for translating the output of the push-pull connected electron discharge devices.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
US247350A 1927-01-17 1928-01-17 Wireless telegraphy and telephony Expired - Lifetime US1876124A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1390/27A GB288736A (en) 1927-01-17 1927-01-17 Improvements in or relating to wireless telegraphy and telephony

Publications (1)

Publication Number Publication Date
US1876124A true US1876124A (en) 1932-09-06

Family

ID=9721149

Family Applications (1)

Application Number Title Priority Date Filing Date
US247350A Expired - Lifetime US1876124A (en) 1927-01-17 1928-01-17 Wireless telegraphy and telephony

Country Status (5)

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US (1) US1876124A (en)van)
BE (1) BE348092A (en)van)
DE (1) DE490367C (en)van)
FR (1) FR647204A (en)van)
GB (1) GB288736A (en)van)

Also Published As

Publication number Publication date
DE490367C (de) 1930-01-25
GB288736A (en) 1928-04-17
FR647204A (fr) 1928-11-21
BE348092A (en)van)

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